# ExecutionPreview
<a name="API_ExecutionPreview"></a>

Information about the changes that would be made if an execution were run.

## Contents
<a name="API_ExecutionPreview_Contents"></a>

**Important**  
This data type is a UNION, so only one of the following members can be specified when used or returned.

 ** Automation **   <a name="systemsmanager-Type-ExecutionPreview-Automation"></a>
Information about the changes that would be made if an Automation workflow were run.  
Type: [AutomationExecutionPreview](API_AutomationExecutionPreview.md) object  
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/ssm-2014-11-06/ExecutionPreview) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/ssm-2014-11-06/ExecutionPreview) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/ssm-2014-11-06/ExecutionPreview)